<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			.yuany{
				width: 500px;
				height: 500px;
				border-radius: 50%;
				overflow: hidden;
				position: relative;
			}
			.yuan-lefty{
				position: absolute;
				width: 100%;
				height: 100%;
				overflow: hidden;
				background: green;
				clip: rect(0px 250px 500px 0px);
			}
			.yuan-leftx{
				background: red;
				overflow: hidden;
				clip: rect(0px 500px 500px 250px);
				transform: rotate(0deg);
				width: 100%;
				height: 100%;
				position: absolute;
			}
			.yuan-righty{
				position: absolute;
				width: 100%;
				height: 100%;
				overflow: hidden;
				background: green;
				clip: rect(0px 500px 500px 250px);
			}
			.yuan-rightx{
				background: red;
				overflow: hidden;
				clip: rect(0px 250px 500px 0px);
				transform: rotate(45deg);
				width: 100%;
				height: 100%;
				position: absolute;
			}
			.clear{
				clear: both;
			}
		</style>
	</head>
	<body>
		<div class="yuany">
			<div class="yuan-lefty">
				<div class="yuan-leftx">
					
				</div>
			</div>
			<div class="yuan-righty">
				<div class="yuan-rightx">
					
				</div>
			</div>
			<span class="clear"></span>
		</div>
	</body>
</html>
